POWER-DRIVEN TORQUE INTENSIFIER

Abstract

A torque intensifying tool for tightening and loosening threaded connectors has at least one torque intensifier means having a torque intensifier housing portion, having input means and having a first output means and a second output means, a drive operatively connected with the input means for transmitting a torque from the drive through the intensifying means to a threaded connector, so that in one mode of operation the torque intensifier housing portion together with the first and the second output means turn in the same direction and the same speed and torque as the input means, and in another mode of operation the torque intensifier housing portion together with one of the first and second output means receives a turning force in one direction while the other one of the first and second output means receives an equal turning force in the opposite direction at a lower speed but higher torque than the input means, and so that one of the first and second output means turns in the one mode and in the another mode while the other of the first and second output means turns in the one mode and reacts in the another mode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 1 b are views showing a torque intensifying tool for tightening and loosening threaded connectors in accordance with one embodiment of the present invention, wherein FIG. 1a is a view showing the tool in one mode of operation and FIG. 1b is a view showing the tool in another mode of operation;

FIG. 2 a-2c are views showing a torque intensifying tool in accordance with another embodiment of the present invention, wherein FIG. 2a is a view showing the tool in one mode of operation, FIG. 2b is a view showing the tool in another mode of operation, and FIG. 2c showing a tool end;

FIG. 3 is a view showing a torque intensifying tool for tightening and loosening threaded connectors in accordance with a further embodiment of the present invention; and

FIGS. 4 a-4b are views showing another embodiment of the inventive torque intensifying tool in two different modes of operation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A torque intensifying tool for tightening and loosening threaded connectors has drive means which are identified as a whole with reference numeral 1. The drive means 1 can have a drive housing 2 and a drive which is identified with reference numeral 3. The drive means 1 can be formed as a motor drive means, in which case it can include a motor. It is also possible that the drive means 1 is formed as manual drive means, for example as a torque wrench. The drive means 1 generate a torque which is to be transmitted for operation. In the embodiment shown in FIGS. 1a, 1b the drive housing 2 has a handle 4 which is to be held by an operator and provided with switching means 5 for switching the drive means between an inoperative position and an operative position.

The torque intensifying tool in accordance with the present invention further has at least one torque intensifier means which are identified as a whole with reference numeral 6. The torque intensifier means 6 have a torque intensifier housing 7 and gear means connected to the drive means 1. In the embodiment shown in FIGS. 1a, 1b the gear means include a sun gear 8 having a shaft which forms an input means, planetary gears 9 and a planet cage 10. The torque intensifier housing 7 is provided with an internal gear 11 which extends only over a longitudinal portion of the housing 7.

The torque intensifying tool in accordance with the present invention further has a driving element which is identified as a whole with reference numeral 12 and forms a first output means. The driving element 12 has a driving part 13 which can be formed for example as a square drive and a rear part 14 which is drivingly connected with the torque intensifier means, for example by interengaging splines. The connection of the drive means 1 with the torque intensifier means 6 and the driving element 12 provides transmission of torque from the drive means to the driving element. The torque intensifier means 6 can be configured to provide any desired intensification of a torque generated by the drive means 1.

The torque intensifying tool further has a reaction element which is identified with reference numeral 15 and forms a second output means. The reaction element 15 is provided with means 16 for connecting with an element reacting against a stationary object, for example a reaction arm, for example with splines. The reaction element 15 is non rotatably connected with the torque intensifier housing 7. In the embodiment shown in FIGS. 1a and 1b, the reaction element 15 is formed integral one-piece with the torque intensifier housing.

The torque intensifying tool has two different modes of operation. In one mode of operation when the torque is transmitted from the drive means 1 through the torque intensifier means to the driving element 12 the driving element 12 provides a lower torque and a higher speed of turning. This is advantageous when it is necessary to turn one part of the threaded connector, for example a nut, on another part of the threaded connector, for example a bolt, with a high speed until the nut is seated on a washer or on the face of an application. In this mode of operation the torque is transmitted from the drive means, through the torque intensifier housing 7, the gears of the torque intensifier, the second output means or the reaction element 15, and the first output means or the driving element 12, so that the torque intensifier housing 7 together with the first output means and the second output means turn in the same direction and at the same torque and speed as the input means.

In another mode of operation the torque is transmitted from the drive means 1 through the torque intensifier means to the driving element 12 so that the torque intensifier housing 7 together with the second output means or the reaction element 15 receives a turning force in one direction, while the first output means or the driving element 12 receives an equal turning force in the opposite direction at a lower speed but higher torque then the input means.

For switching the tool between these two different modes, in the embodiment shown in FIGS. 1a, 1b for example pushing elements 17, formed as pins and the like are provided. When the nut is seated on the washer, the pushing elements 17, which in FIG. 1a illustrating one mode of operation extend outwardly beyond the torque intensifier housing 7, are pushed in an axial direction as shown in FIG. 1b, and the planet cage 10 which was previously engaged with the internal gear 11 of the torque intensifier housing 7 disengages from the internal gear, so that the first output means or the driving element 12 and the second output means or the reaction element 15 can turn in opposite directions. It is to be understood that different means for switching between two different modes of operation are possible.

In accordance with the present invention in the torque intensifying tool the torque intensifier housing 7 and the drive housing 2 are functionally connected with one another. In particular, the torque intensifier housing 7 can turn relative to the drive housing 2. For this purpose, as shown in FIGS. 1a, 1b, a part of the drive housing 2, which can contain additional torque intensifier means, can extend into the torque intensifier housing 7 and be supported in the latter through a bearing 18. With this construction, the torque intensifier housing 7 can freely turn relative to the drive housing 2. The drive housing 2 can be formed as an enclosure, as a support, as a frame, etc. for the drive. This also can be done by a switch automatically once the torque required exceeds a given force.

In another embodiment of the present invention which is shown in FIGS. 2a-2c the first output means is formed as a driving socket 21 which has a portion 22 with a polygonal inner surface to engage the nut and a portion 23 with a polygonal outer shape. The second output means is also formed as a reaction socket having a portion 24 with a polygonal shape for engaging a neighboring object, for example a washer, and a portion 25 with an inner polygonal opening configured to cooperate with the polygonal portion 23 of the driving socket. The driving socket has a receiving opening 26 in which a square drive 27 of a tool can be received. A spline portion 28 of the tool is received in an inwardly spline adaptor 29 which is non-rotatably connected with the reaction socket.

The driving socket is axially movable relative to the reaction socket. For one mode of operation the portion 23 of the driving socket engages in the portion 25 of the reaction socket so that the sockets become non-rotatably connected with one another as shown in FIG. 2a and the torque of the drive means 1 is transmitted through the torque intensifier to the driving socket at the same speed and torque as the input means. In this mode the first and second output means turn.

When as shown in FIG. 2b the driving socket is axially displaced for example so that its portion 23 is disengaged from the portion 25 of the reaction socket, the driving socket and the reaction socket are no longer non-rotatably connected with one another in the other mode of operation and they turn in opposite directions with equal turning forces at a lower speed but higher torque than the input means. In this mode the first output means or the driving socket turn, while the second output means or the reaction socket reacts.

In this embodiment in one mode of operation the torque intensifier housing together with the driving socket and reaction socket turn in the same direction and at the same speed and torque as the input means, wherein in the other mode of operation the torque intensifier housing together the reaction socket receives a turning force in one direction while the driving socket receives the turning force in the opposite direction.

It is to be understood that in the other mode the first and second output means can both act as driving means or reaction means in opposite directions depending on application.

In the embodiment shown in FIG. 3 a nut to be tightened or loosened is identified with reference numeral 31, a bolt on which the nut is to be tightened or loosened is identified with reference numeral 32, and a washer is identified with reference numeral 33 and has a radially outer holding portion 34 and a radially inner portion 35 engageable with the bolt 32. Means is provided for transmitting torque in the two modes of operation. They can be formed for example as connecting pins 36 which engage in aligned openings 38 of the nut and the washer.

In one mode of operation the pins 36 non-rotatably connect the nut with the washer so that they turn together with the same speed and torque as the input means. After the nut is seated on the washer, and a torque increases, the pins 36 are disintegrated, for example sheared off, so that the nut is turned with a higher torque and a lower speed than the input means while the washer provides a reaction.

It is to be understood that the at least two modes as described herein are merely examples. Further modes can be added to said one or said other modes and/or said input means and/or output means.

While the torque intensifying tool described hereinabove is a two speed tool, the present invention is not limited to merely two speeds but can have multiple speeds, as shown for example in FIGS. 4a, 4b. For example the drive operatively connected with the input means of the torque intensifier means can be configured as an intermediate drive housing 50 so that the drive includes for example the drive housing 2 and the intermediate drive housing 50.

When two usually opposite turning parts are temporarily connected with one another in the torque intensifier means or at an end thereof and the intermediate drive housing 50, which contains at least one intensifier unit such as for example a planetary gear stage, is connected with the torque intensifier housing so as not to rotate relative to it a), the turning of the torque intensifier housing together with the first and second output means is at a speed and torque of what is derived from the drive housing portion 2. When the torque required to turn the fastener exceeds that torque derived from the drive housing 2 and the intermediate drive housing 50 is non-rotatably connected with the drive housing 2 b), and rotatably connected with the torque intensifier housing, the turning of the torque intensifier housing 7 together with the first and second output means is at a lower speed but higher torque of what is derived from the drive housing 2. When the turning friction of the fastener is such that the tool switches from one mode to another, the torque applied to the fastener is one more times increased while the turning speed is further decreased. In FIG. 4a the intermediate drive housing portion 50 is non-rotatably connected with the torque intensifier housing 7, while in FIG. 4b the intermediate drive housing 50 is non-rotatably connected with the drive housing 2.

It should also be mentioned that the torque intensifier is not limited just to planetary gears. It can also be composed of any type of mechanisms that increase the torque output relative to the torque input.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.

While the invention has been illustrated and described as embodied in a motor-driven torque intensifier, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

Claims

1. A torque intensifying tool for tightening and loosening threaded connectors, comprising at least one torque intensifier means having a torque intensifier housing portion, having input means and having a first output means and a second output means; a drive operatively connected with said input means for transmitting a torque from said drive through said intensifying means to a threaded connector, so that in one mode of operation said torque intensifier housing portion together with said first and said second output means turn in the same director and the same speed and torque as said input means, and in another mode of operation said torque intensifier housing portion together with one of said first and second output means receives a turning force in one direction while the other one of said first and second output means receives an equal turning force in the opposite direction at a lower speed but higher torque than said input means, and so that one of said first and second output means turns in said one mode and in said another mode while the other of said first and second output means turns in said one mode and reacts in said another mode.

2. A torque intensifying tool as defined in claim 1, wherein said first output means is configured as a driving element for turning one part of the threaded connector, whereas said second output means is configured as a reaction element for reacting during the turning of the one part of the threaded connector, so that in the other mode of operation said torque intensifier housing portion receives a turning force together with said reaction element while said driving element receives the equal turning force in the opposite direction.

3. A torque intensifying tool as defined in claim 1, wherein said first output means is configured as a driving socket for turning one part of the threaded connector, whereas said second output means is configured as a reaction socket for reacting during the turning of the one part of the threaded connector, so that in the other mode of operation said torque intensifier housing portion receives a turning force together with said reaction socket while said driving socket receives the equal turning force in the opposite direction.

4. A torque intensifying tool as defined in claim 1; and further comprising at least one drive housing portion; and means for functionally connecting said torque intensifier housing portion and said drive housing portion with one another so that said housing portions are turnable relative to one another.

5. A torque intensifying tool as defined in claim 4; and further comprising an intermediate drive housing portion to provide at least three speeds of operation, including a high speed low torque in said one mode when said intermediate drive housing portion is rotatably connected with said at least one drive housing portion and non-rotatably connected with said torque intensifier housing portion, a medium speed higher torque in said one mode when said intermediate drive housing portion is rotatably connected with said at least one drive housing portion and rotatably connected with said torque intensifier housing portion, and at a low speed and highest torque in said another mode when the tool switches from one mode to another.

6. A torque intensifying tool as defined in claim 2, wherein said intensifier housing portion is formed of one piece with said reaction element.

7. A torque intensifying tool as defined in claim 2, wherein said intensifier housing portion is connected with said reaction element through connecting means.

8. A torque intensifying tool as defined in claim 1; and further comprising means for connecting one part of the threaded connector to another part of the threaded connector and is configured so as to be integral one-piece in said one mode of operation and to disconnect the parts of the threaded connector from one another to be a two-piece configuration in said another mode of operation.

9. A torque intensifying tool as defined in claim 1; and further comprising means for switching from the one mode of operation to the other mode of operation automatically when the one part of the threaded connector is seated on another part of the threaded connector.

10. A torque intensifying tool as defined in claim 1; and further comprising means for switching from the one mode of operation to the other mode of operation with a switch when the one part of the threaded connector is seated on another part of the threaded connector.

11. A torque intensifying tool as defined in claim 1; and further comprising means for switching from the one mode of operation to the other mode of operation by means of moving the tool in an axial direction of the threaded fastener when the one part of the threaded connector is seated on another part of the threaded connector.

12. A torque intensifying tool as defined in claim 5, wherein said shifting from one speed to another is automatic.

13. A torque intensifying tool as defined in claim 1, wherein said drive is configured as a hand torque tool.

14. A torque intensifying tool as defined in claim 1, wherein said drive includes a motor with a motor housing.

15. A torque intensifying tool as defined in claim 1, wherein said drive includes a motor and at least one intensifier to increase an output torque of said drive.

16. A torque intensifying tool as defined in claim 15, wherein said at least one torque intensifier is configured so as to limit the output torque of said drive so that its reaction force is absorbable by an operator.

17. A torque intensifying tool as defined in claim 1, wherein said drive includes a motor-operated torque tool.